Abstract: A sheet material accumulating apparatus for accumulating a sheet material W into an accumulated bundle P by arranging it in a mutually overlapping state is configured to be able to suppress an enlargement, a higher tallness, more complication, etc. of the apparatus and attain a curtailment of various costs, including a manufacture cost.

Abstract: A sheet material accumulating apparatus for accumulating a sheet material W into an accumulated bundle P by arranging it in a mutually overlapping state is configured to be able to suppress an enlargement, a higher tallness, more complication, etc. of the apparatus and attain a curtailment of various costs, including a manufacture cost.

Abstract: Provided are a sheet material accumulating method and a sheet material accumulating apparatus capable of performing a proper accumulation of a sheet material that does not produce a defective in the next process even when an overlap condition of a conveyed sheet material, such as a printed sheet, varies. Provided is a sheet material accumulating method for accumulating the sheet material W continuously conveyed from the above while a part of the sheet material W is overlapped, with the sheet material standing on a lower horizontal table 7, including the steps of: detecting a backpressure F that a bundle of sheet materials applied to a holder 8 for preventing a head side collapse of a bundle of sheet materials accumulated on the table during an accumulation process; and controlling a movement of the holder in an accumulation direction so that a backpressure may maintain a predetermined magnitude.